Help with a game in javascript

Hello everyone !
I am newbie to javascript ...
can you please help with this
http://jeanferdysusini.free.fr/TP_code.html
I would like to add
1)Repair the display of the time remaining in the game.
2)Add the endgame jingle
3)Add an end-of-game message.
4)Add a control to set the button's “leak” reaction time delay.